Trapped-mode resonances in asymmetric terahertz subwavelength structures

We demonstrate that the trapped-mode resonance with Fano-shaped spectrum can be induced in terahertz metamaterial with asymmetric double-bar structure. Spacing between two bars permits the tuning of resonant position and lineshape in a controlled manner, showing an anomalous increased coupling strength with spacing. The steep phase change around transparency region indicates slow-light effect proved by the retrieved group delays. Simulated results verify the coupling that exists between the bars of the same unit cell and those of the neighbouring cells. Our simplified structure offers the potential application in terahertz modulators and slow-light devices.

[1]  U. Fano.  Effects of Configuration Interaction on Intensities and Phase Shifts , 1961 .

[2]  X. Zhang,et al.  Broadband detection capability of ZnTe electro-optic field detectors , 1996 .

[3]  S. Harris,et al.  Light speed reduction to 17 metres per second in an ultracold atomic gas , 1999, Nature.

[4]  P. Nussenzveig,et al.  Classical analog of electromagnetically induced transparency , 2001, quant-ph/0107061.

[5]  Bernhard Lamprecht,et al.  Optical properties of two interacting gold nanoparticles , 2003 .

[6]  M. Wegener,et al.  Magnetic Response of Metamaterials at 100 Terahertz , 2004, Science.

[7]  Shanhui Fan,et al.  Stopping light in a waveguide with an all-optical analog of electromagnetically induced transparency. , 2004, Physical review letters.

[8]  David R. Smith,et al.  Electromagnetic parameter retrieval from inhomogeneous metamaterials. , 2005, Physical review. E, Statistical, nonlinear, and soft matter physics.

[9]  M. Wegener,et al.  Simultaneous Negative Phase and Group Velocity of Light in a Metamaterial , 2006, Science.

[10]  Willie J Padilla,et al.  Dynamical electric and magnetic metamaterial response at terahertz frequencies , 2006, 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference.

[11]  M. Wegener,et al.  Negative-index metamaterial at 780 nm wavelength. , 2006, Optics letters.

[12]  N I Zheludev,et al.  Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry. , 2007, Physical review letters.

[13]  Y. Wang,et al.  Plasmon-induced transparency in metamaterials. , 2008, Physical review letters.

[14]  Nikolay I. Zheludev,et al.  Metamaterial with polarization and direction insensitive resonant transmission response mimicking electromagnetically induced transparency , 2009 .

[15]  F. Lederer,et al.  Analogue of electromagnetically induced transparency in a terahertz metamaterial , 2009, 0907.1937.

[16]  F. Lederer,et al.  Coupling between a dark and a bright eigenmode in a terahertz metamaterial , 2009, 0901.0365.

[17]  Lei Zhang,et al.  Planar designs for electromagnetically induced transparency in metamaterials. , 2009, Optics express.

[18]  Willie J Padilla,et al.  A metamaterial solid-state terahertz phase modulator , 2009 .

[19]  X Zhang,et al.  Plasmonically induced transparent magnetic resonance in a metallic metamaterial composed of asymmetric double bars. , 2010, Optics express.

[20]  P. Nordlander,et al.  The Fano resonance in plasmonic nanostructures and metamaterials. , 2010, Nature materials.

[21]  Lin Kang,et al.  Superconducting terahertz metamaterials mimicking electromagnetically induced transparency , 2011 .

[22]  Zeyong Wei,et al.  Subwavelength electromagnetic diode: One-way response of cascading nonlinear meta-atoms , 2010, 1012.2252.

[23]  Zeyong Wei,et al.  Nonlinear properties of meta-dimer comprised of coupled ring resonators , 2011 .

[24]  D. R. Chowdhury,et al.  Observing metamaterial induced transparency in individual Fano resonators with broken symmetry , 2011 .

[25]  Qingli Zhou,et al.  Ultrafast optical modulation of terahertz metamaterials , 2011 .

[26]  Martin Koch,et al.  Sharp Fano resonances in THz metamaterials. , 2011, Optics express.

[27]  Zhen Tian,et al.  Manipulating the plasmon-induced transparency in terahertz metamaterials. , 2011, Optics express.

[28]  S. Maier,et al.  Active control of electromagnetically induced transparency analogue in terahertz metamaterials , 2012, Nature Communications.

[29]  X. Zhang,et al.  Transparency window for the absorptive dipole resonance in a symmetry-reduced grating structure. , 2012, Optics express.

[30]  Zhen Tian,et al.  Electromagnetically induced transparency in terahertz plasmonic metamaterials via dual excitation pathways of the dark mode , 2012 .

[31]  M. Walther,et al.  Fano line shape and phase reversal in a split-ring resonator based metamaterial , 2013 .

[32]  C. Soukoulis,et al.  Low-loss and high-Q planar metamaterial with toroidal moment , 2013 .

[33]  Qingli Zhou,et al.  Study of dipole arrays at terahertz frequencies , 2013 .

[34]  Masayoshi Tonouchi,et al.  Plasmon-induced transparency in metamaterials: Active near field coupling between bright superconducting and dark metallic mode resonators , 2013 .

[35]  H. Bağcı,et al.  A dynamically reconfigurable Fano metamaterial through graphene tuning for switching and sensing applications , 2013, Scientific Reports.

[36]  Masayoshi Tonouchi,et al.  Broadband plasmon induced transparency in terahertz metamaterials , 2013, Nanotechnology.

[37]  R. Peng,et al.  Dual-mode electromagnetically induced transparency and slow light in a terahertz metamaterial. , 2014, Optics letters.

[38]  Hai‐feng Zhang,et al.  Electromagnetically induced transparency with large group index induced by simultaneously exciting the electric and the magnetic resonance , 2014 .

[39]  M. Takeda,et al.  Ultrafast optical control of group delay of narrow-band terahertz waves , 2014, Scientific Reports.

[40]  Ziqiang Yang,et al.  Controlling the transparency window in terahertz band using mode coupling metamaterials , 2015 .